From diffusion processes to adherence properties in NiTi microactuators

Diffusion processes taking place at the NiTi/Si, NiTi/SiO₂ and NiTi/Si₃N₄ interfaces under annealing are studied in order to understand the adherence properties of these systems after annealing. Secondary ion mass spectrometry (SIMS), X-ray photoelectron spectroscopy (XPS) assisted by argon etching and electron-induced X-ray emission spectroscopy (EXES) are combined in order to analyse at a nanometric scale the interfaces before and after annealing. Considerable differences between diffusion processes in NiTi/Si and NiTi/SiO₂ are observed and can explain the difference between adherence properties of these systems after annealing. Among the three studied systems, NiTi/Si₃N₄ is shown to be the most suited for low voltage microactuation applications.     

橡胶履带附着性能的测试分析

本通过对工程机械用橡胶履带附着性能的测试，得出了附着力及下陷量随土壤含量的变化规律，并将其与红旗－１００推土机用的金属履带附着力及下陷量进行比较。简要分析了形成橡胶履带与金属履带附着力及下陷量判别的机理。     

Poly(dopamine) assisted deposition of adherent PPy film on Ti substrate

This study aims to address an issue to a subject that is still less present in literature: the adherence of polypyrrole (PPy) films on bioinert substrate. The poly(dopamine) (PDA) assisted deposition of PPy film on titanium substrate was performed in two steps. The chemical self-polymerization of dopamine was performed as a preliminary step from dopamine in Tris buffer solution on titanium substrate. Then, the resulted poly(dopamine) layer consisting of anchors with strong interactions with Ti surface was a new suitable substrate for polypyrrole film electrochemical deposition. The new PDA–PPy films were characterized in terms of interest properties for the desired biomedical applications: adherence, electrochemical stability of PDA–PPy film, wettability, topography, morphology and antibacterial effect. The poly(dopamine) assisted deposition of PPy film has been shown to be a facile and efficient route to improve the adhesion of PPy film on titanium maintaining or improving the properties of polymeric film.     

An evaluation on PAH degradation and characteristics as media of PVA-derivative hydrogels prepared by using a CGA technique

We manufactured PVA-derived hydrogels wth some crosslinkers by using a foam generation technique. Amino acids gels showed remarkably higher swelling ratios, probably because of the highly crosslinked network along with hydrogen bonds. Boric acid and starch would catalyze dehydration while structuring to result in much lower water content and accordingly high gel content, leading to less elastic, hard gels. Bulky materials such as ascorbic acid or starch produced, in general, large pores, and also nicotinamide, highly hydrophobic, was likely to enlarge its pore size, thus leading to reduced swelling. Hydrophilic (or hydrophobic), functional groups which are involved in the reaction or physical linkage, and bulkiness of crosslinkers were found to be more critical to the crosslinking structure and its density than molecular weights that seemed to be closely related to pore sizes. The average sizes of pores were 20 μm for methionine, 10–15 μm for citric acid, 50–70 μm for L-ascorbic acid, 30–40 μm for nicotinamide, and 70–80 μm for starch. Also, amino acid and glucose gels were more elastic than the others. The elasticity of a gel was reasonably correlated with its water content or swelling ratio. On the other hand, L-ascorbic acid among glucose, methionine, citric acid and vitamins, imparted not only the most favorable physical properties and the greatest cell density but also the highest PAH degradation on its derivative gels. The higher biomass ensured the higher degradation rate. The maximum cell density was 0.267 mg/g-hydrogel and degradation rates and efficiencies ranged 0.013–0.007 mM/mg/day and 92-48%, respectively.     

New procedure for measuring adherence between a geosynthetic material and a bituminous mixture

The aim of this investigation was to analyze the adherence between two layers of bituminous mixture when a geosynthetic material is placed between them. A new monotonic test procedure was developed that enables the evaluation of the influence of the binder type and content, and the typology of the geosynthetic material used. The validity of the procedure was demonstrated using dynamic tests. The results confirmed that highest adherence between layers is obtained through geogrids, with optimal residual binder content of 0.30 kg/m². In contrast, the tests with geotextiles were found to be less sensitive to binder content, with lower shear resistance for higher contents of binder.     

钛基生物搪瓷的密着机理研究

通过扫描电子显微镜、元素线扫描、薄膜Ｘ射线衍射和界面剪切强度测定，探讨了钛基生物搪瓷的密着机理和工艺因素对密着强度的影响     

无铅建筑铝搪瓷的密着机理研究

采用扫描电子显微镜、电子探针等分析无铅建筑铝搪瓷界面的显微结构和元素分布，并结合铝搪瓷的密着强度，探讨了无铅建筑铝搪瓷的密着机理。结果表明，密着性能优良的无铅建筑铝搪瓷面存在铝元素与瓷釉元素相互扩散的中间过渡层；中间过渡层与金属铝的结合主要通过金属键来实现，中间过渡层与瓷釉层的结合主要是通过离子键和共价键来实现。     

乳化沥青性状的几点认识

分析了乳化沥青结皮的原因，提出了防止结皮的措施；研究了我国乳化沥青残留物制作方法对残留物性能的影响．并与美国ASTM方法相比较，建议采用烘箱法制作乳化沥青残留物；通过三种试验方法，研究了乳化沥青粘附性的评价方法，提出1天水煮法评价乳化沥青粘附性更合理。     

不同脱碳层厚度的A3F钢板与高温瓷釉密着性研究

不同脱碳层厚度的Ａ＿３Ｆ钢板与高温瓷釉密着性研究王禹，胡德林，邵引年（西北工业大学７１００７２）（西北轻工业学院７１２０８１）ＡＳｔｕｄｙｏｎＡｄｈｅｒｅｎｃｅｂｅｔｗｅｅｎＡ＿３ＦＳｔｅｅｌｗｉｔｈＤｉｆｆｅｒｅｎｔＤｅｐｔｈｏｆＤｅｃａｒｂｕｒｉ...     

基材表面状态对涂层结合性能的影响：在SiC基复合材料表面喷涂氧化铝涂层

很多参数都决定着热喷涂涂层的质量,如喷涂粉末性质、供粉状态、粉末的形貌、动力系统以及喷涂环境等。但在这些因素中,涂层与基材间的结合力是最基本的评价指标。为了使涂层和基材间具有良好的结合力,需要对基材进行表面清洁和预处理。通常使用有机溶剂对基材除油去污,并进行喷砂处理增大基材的表面粗糙度。但由于基材（如陶瓷）本身的性质以...